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      <a href="../index.html">all files</a> / <a href="index.html">service/</a> BIASService.ts
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { Injectable } from '@angular/core';
&nbsp;
import { QuoteBasic } from 'service/QuoteBasic';
import { IBIASService } from 'interface/IBIASService';
import { EMAService } from 'service/EMAService';
&nbsp;
@Injectable()
export class BIASService implements IBIASService {
&nbsp;
  constructor(private emaService:EMAService) {
&nbsp;
  }
&nbsp;
  private _cacuBias(list, start, end, nowClose) {
    let sum = 0;
&nbsp;
    // if(start === end) {
    //   return null;
    // }
&nbsp;
    for(let j=start; j&lt;=end; j++) {
      sum+=list[j];
    }
&nbsp;
    if (sum === 0) {
      return 0;
    } else {
      let average = sum / (end - start + 1);
&nbsp;
      let bias = ((nowClose - average) / average * 100).toFixed(3);
&nbsp;
      return parseFloat(bias);
    }
  }
&nbsp;
  compute(quote:QuoteBasic, day:number):Array&lt;any&gt; {
    const biasList = [];
    const count = quote.close.length;
    const emaList = this.emaService.compute(quote,day);
&nbsp;
    if(day &gt; 0){
      for(let i=0; i&lt;count; i++) {
        if(i &lt; day) {
          biasList.push(this._cacuBias(quote.close, 0, i, quote.close[i]));
          continue;
        }
        biasList.push(this._cacuBias(quote.close, i - day + 1, i, quote.close[i]));
      }
    }
    return biasList;
  }
&nbsp;
  update(quote:QuoteBasic, day:number, oldList:Array&lt;any&gt;):Array&lt;any&gt; {
    const oldCount = oldList.length;
    const originCount = quote.close.length;
&nbsp;
    if(originCount &gt; 0 &amp;&amp; day &gt; 0){
&nbsp;
      if(oldCount === 0){
        return this.compute(quote,day);
      }
&nbsp;
      const start = (originCount - day) &lt; 0 ? 0 : (originCount - day);
      const end = (originCount - 1) &lt; 0 ? <span class="branch-0 cbranch-no" title="branch not covered" >0 </span>: (originCount - 1);
      // const emaList = this.emaService.compute(quote, day);
      const times = quote.time;
&nbsp;
      const temp = this._cacuBias(quote.close, start, end, quote.close[end]);
&nbsp;
      if (oldCount &lt; originCount) {
        oldList.push( temp);
      } else {
        oldList[end] = temp;
      }
    }
&nbsp;
    return oldList;
  }
}
&nbsp;</pre></td></tr>
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